Arc-lamp.



Patented July 25, I899.

E. M. CASHION.

A B C L A M P.

(Application filed Aug. 29, 1898.)

(No Model.)

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UNITED STATES PATENT OFFICE.

EDWARD M. CASHION, OF GLENS FALLS, NEW YORK, ASSIGNOR TO HIMSELF, AND JAMES H. S. MCCARTHY, OF SOUTH GLENS FALLS, NEW YORK.

ARC-LAM P.

SPECIFICATION forming part of Letters Patent No. 629,424, dated July 25, 1899.

Application filed August 29, 1898. Serial No. 689,728. (No model.) Y

To all whom it may concern:

Be it known that I, EDWARD M. CASHION, of Glens Falls, in the county of WVarren and State of New York, have invented a new and Improved Arc-Lamp, of which the following is a full, clear, and exact description.

This invention relates to improvements in electric-arc lamps of the type in which the carbon-points are inclosed in an inner glass globe; and the object is to provide a simple and adjustable means for permitting and reg ulating a continuous passage of air through the globe without the intervention of valves or other periodic working devices.

I will describe an arc-lamp embodying my invention, and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a vertical section of an arc-lamp embodying my invention. Fig. 2 is an inside plan view of an air-regulating cap employed. Fig. 3 is a section through the line 3 3 of Fig. 2. Fig. 4 is a plan view of a dust-pan employed, and Fig. 5 is an edge view thereof.

Referring to the drawings, 1 designates the outer globe of the lamp, and 2 is the casing above the same. Arranged in the lamp is the upper carbon 3 and the lower carbon 4, the lowercarbon being adj ustably fixed in a hold or 5 and the upper carbon being movable Vertically in the ordinary manner to form the arc.

The points of the carbons 3 and 4 are arranged within an inner globe 6, the lower end of said globe resting upon a plate 7, which hasan opening through it for the passage of the carbon 4, the said opening being somewhat larger than the diameter of the carbon, so that air may pass through the same. This plate 7 is adjustably connected to a plate 8, having an opening through it, the wall of which is designed to fit snugly upon the carbon 4. These plates 7 and S are made adjustable one relativelyto the other to increase or diminish a space 9 between them, as circumstances may require.

through openings in the plate7and into tapped holesin the plate Sand screws 11 pass through openings in the plate 8 and into tapped holes in the plate 7. Obviously by manipulating the screws the platesmay be adjusted one relatively to the other.

Resting on the top of the globe 6 is a plate 12, and adj ustablyconnected with said plate 12 is a plate 13. The plates 12 and 13 are similar to the plates 7 and 8, excepting that the opening through said plate 13,. is slightly larger than the carbon 3, so as to permit of the movement of said carbon. The plates 12 and 13 are adjustably held together by means of screws, as shown in connection with the plates 7 and 8.

Surrounding the carbon 4 within the globe 6 is a dust-pan 14, which has an opening through it in which the carbon 4 tightly fits, and on its under side it has lugs 15, which rest upon the plate 7, so that a space will be formed between the under side of said dustpan and the upper side of the plate 7 for the passage of air. The object of the dust-pan is to prevent the passage of dust or the like from the interior of the globe to the air-space between the plates 7 and 8, which will have a vent the ingress of air.

The object in forming the caps each of two adjustable plates is to regulate the inlet of. air and the outlet of gases from the globe. The greater the distance between the plates the more freely will the gas escape. The less the distance the less freely will the gases and the hot air escape. As the caps are intended to be used in connection with any kind of lamp or system of electric lighting, the dis tance between the plates will haveto be regulated by the particular system of lighting used. In general it is desirable to separate the plates, so as not to increase the voltage. For instance, if at a certain distance the voltage is increased, increase the distance between the plates and thus allow the gases, &c., to more freely escape, and thus diminish the retendency to stop up or clog the space and pre- .sistance and voltage.

collected on the inner surface of the inner globe is much less than ordinarily.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent- 1. In an arc-lan1p, an inner globe for surrounding the carbon-points, a ventilating-cap on the end of the globe, comprising two plates adjustable one relatively to the other so as to form an air-space between them, the inner of said plates having an opening through which the carbon passes, the said opening being larger than the diameter of the carbon, the outer plate having an opening, the wall of which engages closely against the carbon and a dust-pan on the carbon and adjacent to the inner plate, substantially as specified.

2. In an arc-lamp, an' inner globe for inclosing the carbon-points, a cap at each end of said globe, each cap consisting of an inner and an outer plate having openings for the passage of the carbons, the opening in the inner plate being larger than the carbon, the opening in the lower outer plate fitting the carbon snugly, and screws for engaging and regulating the space between the plates, substantially as specified.

3. In an electric-arc lamp, a globe, caps engaging with the ends of said globe, each cap consisting of two plates having openings for the passage of the carbons, means for adjust ing the space between the plates, and a dustpan surrounding the carbon and supported on the inner plate of the lower cap, substantially as specified.

EDWARD M. OASI-IION.

\Vitnesses:

O. J. BARBER,

FRED L. RUSSELL. 

